00970 IUPAC Gold Book - channel 10.1351/goldbook.C00970 C00970 current 1 Regions of potential-energy surfaces where there are valleys are sometimes referred to as arrangement channels. The reactant channel or entrance channel is that corresponding to configurations similar to those of the reactants; the product channel or exit channel relates to configurations similar to those of the products. In collision theory, the specification of a complete set of quantum numbers in a given arrangement channel is called a channel. collision theory https://goldbook.iupac.org//terms/view/C01170 entrance channel https://goldbook.iupac.org//terms/view/E02148 exit channel https://goldbook.iupac.org//terms/view/E02265 potential-energy surfaces https://goldbook.iupac.org//terms/view/P04780 product https://goldbook.iupac.org//terms/view/P04861 reactant https://goldbook.iupac.org//terms/view/R05163 PAC, 1996, 68, 149. 'A glossary of terms used in chemical kinetics, including reaction dynamics (IUPAC Recommendations 1996)' on page 157 (https://doi.org/10.1351/pac199668010149) 2 That part of an analytical instrument that is dedicated to a single analytical procedure, including the transducer. This term relates to the internal operation of certain types of instruments, particularly in clinical chemistry. The general term channel has a much broader meaning, and the term is not recommended. analytical instrument https://goldbook.iupac.org//terms/view/A00333 transducer https://goldbook.iupac.org//terms/view/T06437 PAC, 1989, 61, 1657. 'Nomenclature for automated and mechanised analysis (Recommendations 1989)' on page 1661 (https://doi.org/10.1351/pac198961091657) https://goldbook.iupac.org/terms/view/C00970/html https://goldbook.iupac.org/terms/view/C00970/json https://goldbook.iupac.org/terms/view/C00970/plain Citation: 'channel' in IUPAC Compendium of Chemical Terminology, 5th ed. International Union of Pure and Applied Chemistry; 2025. Online version 5.0.0, 2025. 10.1351/goldbook.C00970 The IUPAC Gold Book is licensed under Creative Commons Attribution-ShareAlike CC BY-SA 4.0 International (https://creativecommons.org/licenses/by-sa/4.0/) for individual terms. If you are interested in licensing the Gold Book for commercial use, please contact the IUPAC Executive Director at executivedirector@iupac.org . The International Union of Pure and Applied Chemistry (IUPAC) is continuously reviewing and, where needed, updating terms in the Compendium of Chemical Terminology (the IUPAC Gold Book). Users of these terms are encouraged to include the version of a term with its use and to check regularly for updates to term definitions that you are using. 2026-04-18T23:00:59+00:00